Home Office Tax Deductions in Canada: What You Can Claim in 2026

If you work from home in Canada, whether self-employed or an employee, you can deduct a portion of your housing costs on your tax return. The deduction covers expenses like rent or mortgage interest, utilities, and internet, proportional to the space you use for work. The COVID-era flat-rate method ($2 per day) ended after the 2022 tax year. For 2026, only the detailed method is available.

At our firm, home office deductions come up in nearly every self-employed client file. The rules are not complicated, but the calculation has steps that people skip or get wrong, and a few traps (capital cost allowance in particular) that can cost more than the deduction is worth. I am Samer Tohme, CPA, and this guide walks through the full process for claiming home office expenses on your 2026 return.

The Two Qualifying Tests

To claim home office expenses, your workspace must meet one of two conditions set out by the CRA. You do not need to meet both.

Test 1: The home office is your principal place of business. This applies to most self-employed individuals who do not rent a separate office. If you run your consulting practice, freelance business, or online store from a room in your home, this test is satisfied.

Test 2: You use the workspace exclusively to earn business income and you use it on a regular and continuous basis to meet clients or customers. This second test is narrower. “Exclusively” means the space cannot double as a guest bedroom or playroom during non-work hours. In practice, Test 1 is the one most self-employed filers rely on.

Employees have a similar pair of tests, but the threshold is different. An employee must work from home more than 50% of the time, or the employer must require them to maintain a home office. We cover the employee rules briefly later in this post.

If you meet either test, you can deduct a proportional share of your home expenses. The proportion is based on the size of your workspace relative to your total home, which we cover in the calculation section below.

Eligible Expenses for Self-Employed Filers

Self-employed individuals report home office expenses on Form T2125 (Statement of Business or Professional Activities), Part 7. The eligible expenses differ depending on whether you own or rent your home.

A few points on this table. Mortgage principal payments are never deductible. Only the interest portion qualifies. Capital improvements (a new roof, a kitchen renovation) are also excluded. Routine maintenance and minor repairs are fine. The distinction is whether the expense maintains the property’s current condition (deductible) or improves it beyond its original state (not deductible).

Internet is deductible at the business-use percentage, the same ratio you apply to other expenses. If you have a dedicated business phone line, 100% of that cost is deductible. If you use your personal cell for business calls, only the business portion is deductible.

How to Calculate the Business-Use Percentage

The CRA accepts two methods for determining the business-use portion of your home: the square footage method and the rooms method. Square footage is more precise and is what we recommend.

Square footage method: Divide the area of your workspace by the total finished area of your home.

Example: Your home office is 150 square feet. Your home’s total finished area is 1,200 square feet. Your business-use percentage is 150 / 1,200 = 12.5%.

Rooms method: Divide the number of rooms used for business by the total number of rooms in the home. This only works if your rooms are roughly equal in size. A 300-square-foot living room and a 90-square-foot office are not “equal,” so the rooms method would overstate your claim. The CRA may challenge it.

Once you have your percentage, apply it to each eligible expense.

Here is a worked example for a self-employed consultant who owns a home in Ottawa:

That is $3,450 in deductions on a home with annual carrying costs of $27,600. At a marginal tax rate of 43.41% (Ontario, taxable income between $106,717 and $150,000), this deduction saves about $1,497 in tax. The savings scale with income. At higher brackets, the same deduction is worth more.

If you also use the space part-time (say, 60% of the week), some tax professionals prorate the percentage further. The CRA has not published explicit guidance requiring a time-based adjustment for self-employed filers who meet the “principal place of business” test, but keeping a log of your work hours from home strengthens your position if the claim is reviewed. If you are not sure how to calculate the right percentage or which expenses qualify, our team at Tohme Accounting walks clients through this as part of every self-employed tax return. Get in touch here.

Employees Working from Home

Employees follow a different process. You need a signed Form T2200 (Declaration of Conditions of Employment) from your employer confirming that you are required to work from home and that you are required to pay your own expenses. Without the T2200, you cannot claim.

Employee claims are reported on Form T777 (Statement of Employment Expenses). The eligible expenses are more limited than for self-employed filers. Employees can claim utilities, internet, rent (if applicable), and office supplies. They cannot claim mortgage interest, property taxes, or home insurance. Commission employees have a slightly broader list that includes insurance.

The flat-rate method that simplified employee claims during COVID ($2 per day, no receipts required) is no longer available. For the 2026 tax year, employees must use the detailed method with receipts, and they must have a T2200 on file.

If you are an employee working from home, the deductions are smaller and the paperwork is more involved. If you are self-employed, the T2125 route gives you a broader set of eligible expenses and does not require an employer form.

The CCA Trap: Why You Should Not Claim Capital Cost Allowance

Capital cost allowance (CCA) lets you deduct a portion of the cost of a capital asset over time, and technically, your home qualifies. You can claim CCA on the business-use portion of a home you own. But in almost every case, you should not.

Here is why. When you claim CCA on your home, the CRA treats that portion of the property as having been converted to business use. This triggers a deemed disposition at fair market value for the business-use portion. More importantly, it compromises your principal residence exemption (PRE) on that portion of the home.

The PRE eliminates capital gains tax when you sell your primary home. It is one of the most valuable tax benefits available to Canadian homeowners. If your home appreciates by $300,000 and you claimed CCA on 12.5% of it, you could owe capital gains tax on $37,500 of that appreciation, plus you would face CCA recapture on the CCA you claimed over the years. The recapture is taxed at your full marginal rate.

The annual CCA deduction on a home office is typically small. On a $500,000 home at 12.5% business use, the depreciable amount is $62,500. At the Class 1 CCA rate of 4%, your first-year deduction is about $1,250 (half-year rule applies in year one). That is a modest tax saving compared to the risk of losing tens of thousands of dollars in PRE protection.

Our advice to clients: claim the operating expenses (interest, taxes, utilities, insurance) and skip CCA on the home entirely. The math almost never favors it.

The Loss Restriction Rule

Your home office deduction cannot create or increase a business loss. If your business revenue minus other expenses is $2,000 but your home office costs total $3,450, you can only claim $2,000 of home office expenses for the year. The remaining $1,450 carries forward to future years and can be claimed when you have enough business income to absorb it.

This rule exists to prevent taxpayers from using home office expenses to generate artificial losses that offset employment or investment income. The unused amount does not expire. It carries forward indefinitely until your business income is large enough to use it.

In your first few years of self-employment, the loss restriction rule may limit your claim. Track the carryforward amount carefully. Once your business income grows, you can apply the accumulated home office expenses from prior years.

What Records the CRA Expects

Under ITA section 230, every person carrying on a business must keep adequate books and records. For home office claims specifically, “adequate” means:

Proof of the workspace. Measure your office and your total home area in square feet. Take dated photographs of the workspace showing it is set up for business use. The CRA may ask for this during an audit, and having photos from the tax year in question is better than trying to recreate the setup later.

Receipts for every expense claimed. Keep utility bills, property tax statements, insurance premiums, mortgage statements (showing interest separately from principal), internet bills, and phone bills. Digital copies are fine. The CRA accepts scanned receipts.

A record of how you calculated the percentage. Write down the square footage calculation. If you adjusted for time (part-time use), document that too. Put this in a note you keep with your tax file, not just in your head.

Under ITA section 67, every expense must be “reasonable in the circumstances.” A 12.5% claim for a dedicated 150-square-foot office is reasonable. A 40% claim for a spare bedroom that also stores holiday decorations is harder to defend.

Keep all records for at least six years from the end of the tax year they relate to. The CRA’s standard reassessment period is three years (four for corporations), but they can go back further if they suspect misrepresentation. Having six years of organized records covers you in virtually every scenario.

If you need help determining which expenses qualify or how to calculate your claim, our team handles this routinely for self-employed clients in Ottawa and Toronto. Our guide on quarterly tax filing covers the broader filing process, and you can reach out directly if you want us to handle the calculation for you.